This feature is new in the Solaris Express 8/04 release.
The flex open source lexer is an enhanced version of the lex(1) utility. flex provides the ability to generate very fast (but large) scanners and batch these scanners. flex has the capability to generate scanners with different globally visible variable and function names, as opposed to the lex(1) convention of names such as yy_foo or yy_bar.
For more information, see the man page in the /usr/sfw/man directory.